When Pia learns that she is going to San Francisco instead of her beloved Baltic Sea this summer, she's dumbfounded and can't believe it. Pia is determined to dislike the unknown city, but unexpectedly the colourful metropolis by the sea grows on her. That's probably thanks to Grandma Maple's great biscuit shop and the crazy Villa Futura, where Pia and her parents stay. The biggest surprise, however, is Poppy Williams – the extraordinary girl who suddenly appears barefooted in Pia's room and drags her into the adventure of her life in no time at all.